Browsing Institute's contributions by Subject "denitrification"
Now showing items 21-39 of 39
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Monsoon related changes in sea surface productivity and water column denitrification in the Eastern Arabian Sea during the last glacial cycle
(Elsevier, 2005)Sea surface salinity reconstruction for the Holocene and the Last Glacial Maximum (LGM) suggests that the LGM-Eastern Arabian Sea was more saline (by approx.5 psu) than the Holocene due to weakened freshwater flux to the ... -
Nitrate reduction by fungi in marine oxygen-depleted laboratory microcosms
(Walter de Gruyter, 2010)Fungi are major contributors to the process of denitrification in terrestrial environments, but their role as denitrifiers in the ocean has not been addressed thus far. The nitrate reducing capacity of fungi based on ... -
Nitrite-induced enhancement of toxicity of phenanthrene in fish and its implications for coastal waters
(Elsevier, 2003)Coastal areas are prone to varying degrees of anthropogenic chemical contamination. In many coastal environments experiencing reducing conditions in the water column, nitrite is produced as a result of denitrification. ... -
Nitrogen and oxygen isotopic composition of N sub(2)O from suboxic waters of the eastern tropical North Pacific and the Arabian Sea - measurement by continuous-flow isotope-ratio monitoring
(Elsevier, 1997)Nitrous oxide (N sub(2)O) is a trace gas that is increasing in the atmosphere. It contributes to the greenhouse effect and influence the global ozone distribution. Recent reports suggest that regions such as the Arabian ... -
Nitrogen cycling in the suboxic Arabian Sea: Implications for atmospheric chemistry and climate
(Indian National Science Academy, New Delhi (India), 1999)An acute oxygen deficiency at mid-depths in the Arabian SEa leads to large-scale microbial conversion (denitrification) of the oxidised combined nitrogen species to molecular nitrogen (N sub(2)) at an estimated rate of ... -
Nitrogen cycling in the suboxic waters of the Arabian Sea
(Springer, 2006)Arabian Sea contains one of the world's three large oxygen deficient zones (ODZ). Within the ODZ oxygen concentration is vanishingly small between about 200 and 800 m depth and in this depth interval denitrifications is ... -
Nitrogen isotopic studies in the suboxic Arabian Sea
(Indian Academy of Sciences, Bangalore, India, 1998)Measurements of sup(15)N/ sup(14)N in dissolved molecular nitrogen (N sub(2)), nitrate (NO sub(3) sup(-)) and nitrous oxide (N sub(2)O) and sup(18)O/ sup(16)O in N sub(2)O [expressed as delta sup(15)N and delta sup(18)O, ... -
Oceanography of marginal seas
(Oxford and IBH, New Delhi, 2001)The North Indian Ocean consists of three marginal seas; The Persian Gulf and the Red Sea in the west and the Andaman Sea in the east. Oceanographic features of these semi-enclosed basins have been discussed in this article. ... -
On the renewal of the denitrifying layer in the Arabian Sea
(Elsevier, 1988)A one-dimensional (vertical) advection-diffusion model has been applied to the deep layer characterized by a linear potential temperature(theta)-salinity relationship in the Arabian Sea to estimate the velocity of ascending ... -
Organic carbon, and not copper, controls denitrification in oxygen minimum zones of the ocean
(Elsevier, 2008)Incubation experiments under trace metal clean conditions and ambient oxygen concentrations were used to investigate the response of microbial assemblages in oxygen minimum zones (OMZs) to additions of organic carbon and ... -
Oxygen minimum zone of the open Arabian Sea: variability of oxygen and nitrite from daily to decadal timescales.
(European Geosciences Union, 2014)The oxygen minimum zone (OMZ) of the Arabian Sea is the thickest of the three oceanic OMZ. It is of global biogeochemical significance because of denitrification in the upper part leading to N<SUB>2</SUB> and N<SUB>2</SUB>O ... -
Recent advances in marine microbiology: the Indian scenario
(Springer, 1997)Great strides have been made in understanding the microbes of the seas around India, and these include both mycological and bacteriological aspects, covering near, offshore, and deep-sea waters. In mycology, the role of ... -
Seasonal and spatial variability in N sub(2)O distribution in the Arabian Sea
(Pergamon, 1999)Extensive measurements of nitrous oxide (N sub(2)O) were made in the central and eastern Arabian Sea during the northeast monsoon (February-March), intermonsoon (April-May) and southwest monsoon (July-August) seasons. The ... -
Seasonal and spatial variations in settling manganese fluxes in the northern Arabian Sea
(Pergamon, 1999)Particulate manganese (Mn) fluxes measured with six time series sediment traps showed that the annual settling fluxes were 3-6 times higher in the west compared to those in the east and central Arabian Sea. Annual detrital ... -
Seasonal oxygen deficiency over the western continental shelf of India
(Springer, 2006)The North Indian Ocean contains about two-third of the global continental-margin area affected by natural oxygen deficiency (O2 less than 0.2 mL L sup(-1)) in the water column. Also, the littoral countries of this ... -
The nitrogen cycle in the Arabian Sea
(Elsevier, 2005)Despite their importance for the global oceanic nitrogen (N) cycle, estimates of N fluxes in the Arabian Sea remain in considerable uncertainty. In this report, we summarize current knowledge of important processes, including ... -
The oceanic fixed nitrogen and nitrous oxide budgets: Moving targets as we enter the anthropocene?
(Institut de Ciencies del Mar de Barcelona, 2001)New data forced to raise previous estimates of oceanic denitrification. The revised estimate of approx. 450 Tg N yr sup(-1) (Tg = 10 sup(12) g) produces an oceanic fixed N budget with a large deficit (approx. 200 Tg N yr ... -
The oxygen minimum zone in the Arabian Sea during 1995
(Pergamon, 1999)This paper focuses on the characteristics of the oxygen minimum zone (OMZ) as observed in the Arabian Sea over the complete monsoon cycle of 1995. Dissolved oxygen, nitrite, nitrate and density values are used to delineate ... -
Variable relationships of DOC with oxygen in the northwestern Indian Ocean and their ecological implications
(University of Hamburg, Germany, 1993)The relationships between DOC and AOU in the northwestern Indian Ocean regional variations reflecting the different biological characteristics dominanting the respective zones, resulting in the variable percentages of DOM ...